General

• Vicinity Map
• Region (Map) ............. Pacific Northwest
• State (Map) ...................................... Idaho
• County ............................................. Power
• Project .......................... Minidoka Project
• Dam type ..................... Concrete gravity
                              with embankment wings
• Location .................... American Falls, ID
• Watercourse ........................ Snake River
• Reservoir ......................... American Falls
• Original construction .............. 1925-1927
• Replaced in ............................... 1976-1978
• National ID Number ................... ID00274
• Hydrologic Unit Code ...............

Hydraulics

• Total storage to
    El. 4354.5 ...................... 1,671,300 acre-ft
• Service spillway
    Capacity at El. 4356.2 ............ 98,300 cfs
• Outlet works
    Capacity at El. 4354.5 ............ 19,400 cfs

Dimensions

• Crest Elevation .............................. 4366.5 ft
• Structural Height ............................. 103.5 ft
• Hydraulic Height ............................... 77.5 ft
• Crest Length .................................... 5,277.0 ft
• Crest Width ........................................ 42.5 ft
• Base Width ........................................... 59 ft
• Volume of Concrete ............... 65,000 cu yd

Hydrology

• Drainage area .......................... 13,580 sq mi
• Hydrometeorological Report ............... NA
• PMF ............................. 1981 General Storm
• Volume ...... 4,958,600 acre-ft over 30 days
• Peak inflow ................................ 139,000 cfs
• Maximum water surface ................ 4356.2 ft